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Finding the Fourth Proportional to 1,111.13, 1,533.49 and 645.38

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Solution

The fourth proportional to 1,111.13, 1,533.49 and 645.38 is: 890.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.13 : 1,533.49 = 645.38 : x
  2. Step 2: Convert to fraction form
    1,111.13/1,533.49 = 645.38/x
  3. Step 3: Cross multiply
    1,111.13x = 1,533.49 × 645.38
  4. Step 4: Simplify right side
    1,111.13x = 989,674.50
  5. Step 5: Solve for x
    x = 989,674.50/1,111.13
  6. Step 6: Final answer
    x = 890.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.